CN102698571B

Movatterモバイル変換

Info

Publication number: CN102698571B
Application number: CN201210165113.8A
Authority: CN
Inventors: 高举东
Original assignee: BEIJING JINJIAXIN TRADING CO LTD
Current assignee: BEIJING JINJIAXIN TRADING CO LTD
Priority date: 2012-05-24
Filing date: 2012-05-24
Publication date: 2014-07-02
Anticipated expiration: 2032-05-24
Also published as: CN102698571A

Abstract

本发明提供了一种可有效去除呼出气体样本中含有的水汽以及分泌物和细菌等杂质的水汽过滤器，包括内胆、外套和连接结构；内胆内部包括有贯穿其纵向的气道，内胆还包括用于容纳亲水材料的腔体、和位于腔体内的亲水材料，内胆的外侧壁密封包覆有透湿膜，其中，腔体的腔壁上设置有开口使得腔体内的亲水材料可与透湿膜相通，外套的前端密封固定有带出气孔的底板，外套的后端为开口端，内胆从外套开口端插入外套内腔后，内胆的前端面与底板的后表面之间固定有可覆盖内胆前端面的且将内胆前端面与底板后表面之间隔离的过滤膜，透湿膜为不透气但透水的膜，过滤膜为可透气但不透水的膜；该发明可以延长气体分析仪器的使用寿命，同时保证了患者的身体健康。

The invention provides a water vapor filter that can effectively remove impurities such as water vapor, secretions and bacteria contained in an exhaled gas sample, which includes an inner tank, an outer jacket and a connecting structure; The liner also includes a cavity for accommodating hydrophilic materials and the hydrophilic material in the cavity. The outer wall of the liner is sealed and coated with a moisture-permeable film, wherein the cavity wall of the cavity is provided with an opening so that the inside of the cavity The hydrophilic material can communicate with the moisture-permeable membrane. The front end of the jacket is sealed and fixed with a bottom plate with air holes. The rear end of the jacket is an open end. A filter membrane that can cover the front end of the inner tank and isolate the front end of the inner tank from the rear surface of the bottom plate is fixed between the rear surfaces. The moisture-permeable membrane is an air-tight but water-permeable membrane, and the filter membrane is air-permeable but water-impermeable. Membrane; the invention can prolong the service life of gas analysis instruments, while ensuring the health of patients.

Description

Translated fromChinese

水汽过滤器moisture filter

技术领域technical field

本发明涉及一种医用呼出气体过滤装置，特别是一种用于滤除呼吸里的水汽以及分泌物和细菌等杂质、只允许干燥的呼吸气体通过的水汽过滤器。The invention relates to a medical exhaled gas filtering device, in particular to a water vapor filter for filtering out impurities such as water vapor, secretions and bacteria in breathing, and only allowing dry breathing gas to pass through.

背景技术Background technique

在医学实践中，采用气体分析仪对患者呼出的气体进行测试分析，来检测患者呼吸道病情，必要时可进行报警。但患者呼出的气体样本中通常含有水汽以及分泌物和细菌等有害杂质，其中如果水汽以及分泌物和细菌等含水分的杂质进入气体分析仪中，长久下来会损坏气体分析仪的气路系统。水汽以及分泌物和细菌等含水分的杂质还导致气路系统中的潮湿环境，为细菌的滋生提供条件，造成气路系统中细菌的富集，缩短气体分析仪的使用寿命，危害患者的身体健康。In medical practice, the gas analyzer is used to test and analyze the gas exhaled by the patient to detect the condition of the patient's respiratory tract, and to alarm if necessary. However, the gas samples exhaled by patients usually contain harmful impurities such as water vapor, secretions and bacteria. If water vapor, secretions and bacteria and other moisture-containing impurities enter the gas analyzer, the gas circuit system of the gas analyzer will be damaged for a long time. Moisture-containing impurities such as water vapor, secretions and bacteria also lead to a humid environment in the gas system, providing conditions for the growth of bacteria, resulting in the enrichment of bacteria in the gas system, shortening the service life of the gas analyzer, and endangering the patient's body healthy.

发明内容Contents of the invention

本发明针对现有技术中的不足，提供了一种可有效去除呼出气体样本中含有的水汽以及分泌物和细菌等杂质的水汽过滤器，以延长气体分析仪器的使用寿命，同时保证了患者的身体健康。Aiming at the deficiencies in the prior art, the present invention provides a water vapor filter that can effectively remove impurities such as water vapor, secretions and bacteria contained in the exhaled gas sample, so as to prolong the service life of the gas analysis instrument and ensure the safety of the patient. In good health.

技术方案：Technical solutions:

一种水汽过滤器，其特征在于，包括内胆和与所述内胆的形状、尺寸相适配的外套，还包括用于固定所述内胆与所述外套相对位置的连接结构；所述内胆内部包括有贯穿其纵向的气道，所述气道包括位于内胆后端的进气口和位于内胆前端的出气口，所述内胆还包括用于容纳亲水材料的腔体、和位于所述腔体内的亲水材料，所述内胆的外侧壁密封包覆有透湿膜，其中，所述腔体的腔壁上设置有开口使得腔体内的亲水材料可与透湿膜相通，所述外套的前端密封固定有带出气孔的底板，所述外套的后端为开口端，所述内胆从所述外套开口端插入外套内腔后，所述内胆的前端面与底板的后表面之间固定有可覆盖内胆前端面的且将内胆前端面与底板后表面之间隔离的过滤膜，所述透湿膜为不透气但透水的膜，所述过滤膜为可透气但不透水的膜。A water vapor filter, characterized in that it includes an inner tank and a jacket adapted to the shape and size of the inner tank, and also includes a connecting structure for fixing the relative position of the inner tank and the outer jacket; The interior of the liner includes an airway running through its longitudinal direction, the airway includes an air inlet at the rear end of the liner and an air outlet at the front end of the liner, and the inner liner also includes a cavity for accommodating hydrophilic materials, and the hydrophilic material located in the cavity, the outer wall of the liner is sealed and coated with a moisture-permeable film, wherein an opening is provided on the wall of the cavity so that the hydrophilic material in the cavity can communicate with the moisture-permeable The membranes are connected, the front end of the jacket is sealed and fixed with a bottom plate with air holes, the rear end of the jacket is an open end, and after the liner is inserted into the inner cavity of the jacket from the open end of the jacket, the front surface A filter membrane that can cover the front end of the inner tank and isolate the front end of the inner tank from the rear surface of the base is fixed between the rear surface of the bottom plate. The moisture-permeable membrane is an airtight but water-permeable membrane. It is a breathable but impermeable membrane.

所述腔体位于所述气道的周围，且所述气道内腔与所述腔体内部之间通过一个或若干个通孔相连通。The cavity is located around the airway, and the inner cavity of the airway communicates with the inside of the cavity through one or several through holes.

所述内胆为圆柱体，所述气道位于所述圆柱体的中心，所述腔体为位于所述气道周围的若干个沿内胆长度方向的小腔体，所述小腔体的前端为开口端，所述小腔体的后端为封闭端，所述小腔体的内侧腔壁开设有通向气道内腔的若干小通孔，所述小腔体的外侧腔壁的中间段为所述开口，相应地，所述内胆的外侧壁包括由所述开口形成的凹陷的开放结构和剩余的骨架结构，所述骨架结构包括位于内胆前端的沿内胆外侧壁周向的前端骨架、位于内胆后端的沿内胆外侧壁周向的后端骨架和位于内胆中段的沿内胆纵向的纵骨架，所述透湿膜通过固定在骨架结构上以保证密封包覆所述内胆。The liner is a cylinder, the airway is located at the center of the cylinder, and the cavities are several small cavities located around the airway along the length of the liner. The small cavities The front end is an open end, the rear end of the small cavity is a closed end, the inner cavity wall of the small cavity is provided with some small through holes leading to the inner cavity of the airway, and the middle of the outer cavity wall of the small cavity is Segment is the opening, correspondingly, the outer wall of the inner container includes the open structure of the depression formed by the opening and the remaining skeleton structure, and the skeleton structure includes The front-end frame, the rear-end frame located at the rear end of the liner along the outer wall of the liner, and the longitudinal frame located in the middle of the liner along the longitudinal direction of the liner, the moisture-permeable membrane is fixed on the frame structure to ensure airtight coating the liner.

所述气道的横截面面积小于所述小腔体的横截面面积；或所述亲水材料的前端面位于所述小腔体的前端面上。The cross-sectional area of the air passage is smaller than the cross-sectional area of the small cavity; or the front end surface of the hydrophilic material is located on the front end surface of the small cavity.

所述气道的前端面位于所述内胆前端面的后侧，所述小腔体的前端面位于所述内胆的前端面上。The front end of the airway is located behind the front end of the liner, and the front end of the small cavity is located on the front end of the inner liner.

所述过滤膜与所述底板的后表面之间设置有弹性垫圈。An elastic gasket is arranged between the filter membrane and the rear surface of the bottom plate.

所述外套的对应于内胆的腔体的开口位置上开设有透气结构。A ventilating structure is provided on the opening of the jacket corresponding to the cavity of the liner.

所述底板位于所述外套的前端面的后侧，所述外套还包括一位于所述底板前侧的出气管，所述出气管的一端与所述底板的出气孔固定连通。The bottom plate is located at the rear side of the front end of the outer casing, and the outer casing also includes an air outlet pipe located at the front side of the bottom plate, and one end of the air outlet pipe is fixedly communicated with the air outlet hole of the bottom plate.

所述连接结构包括从内胆后侧延伸出的一段短圆柱体，所述短圆柱体的半径大于所述后端骨架的半径并相对于后端骨架形成一周向的凸台阶结构，所述凸台阶结构上设置有凸块，相应地，所述连接结构还包括在所述外套的相应位置上设置的小开口，所述内胆插入所述外套后，所述凸块卡入所述小开口以固定内胆和外套的相对位置。The connection structure includes a section of short cylinder extending from the rear side of the inner tank, the radius of the short cylinder is greater than the radius of the rear end frame and forms a circumferential convex step structure relative to the rear end frame, the convex Protrusions are provided on the step structure, and correspondingly, the connection structure also includes small openings provided at corresponding positions of the outer casing, and the protrusions are snapped into the small openings after the liner is inserted into the outer casing To fix the relative position of the liner and the coat.

所述短圆柱体的半径与所述后端骨架的半径的差值等于包覆在所述骨架上的透湿膜的厚度。The difference between the radius of the short cylinder and the radius of the rear frame is equal to the thickness of the moisture-permeable membrane covering the frame.

所述内胆的气道的进气口处固定连接有鲁尔接头。The air inlet of the air passage of the inner bag is fixedly connected with a Luer connector.

技术效果：Technical effect:

本发明提供了一种水汽过滤器，包括内胆和外套，外套一端密封固定有带出气孔的底板，外套的另一端为开口端，内胆用于从开口端插入外套内；内胆包括气道和腔体，腔体内装有亲水材料，内胆的外侧壁包覆有透湿膜，内胆的前端面和底板的后表面之间还固定有过滤膜，即，内胆上的过滤膜和透湿膜形成了一个腔体，从气道进入腔体的呼出气体样本中的干燥空气穿过过滤膜并从底板的出气孔排出，呼出气体样本中的水汽和其它含水杂质储存在亲水材料内部，并其中的水分由透湿膜排出水汽过滤器。The invention provides a water vapor filter, comprising an inner container and an outer casing, one end of the outer casing is sealed and fixed with a bottom plate with air holes, the other end of the outer casing is an open end, and the inner container is used for inserting into the outer casing from the open end; the inner container includes an air The cavity is equipped with hydrophilic materials, the outer wall of the inner tank is covered with a moisture-permeable membrane, and a filter membrane is fixed between the front surface of the inner tank and the rear surface of the bottom plate, that is, the filter on the inner tank The membrane and the moisture-permeable membrane form a cavity. The dry air in the exhaled gas sample entering the cavity from the airway passes through the filter membrane and is discharged from the air outlet of the bottom plate. The water vapor and other water-containing impurities in the exhaled gas sample are stored in the hydrophilic Water inside the material, and the moisture in it is discharged from the water vapor filter through the moisture-permeable membrane.

用于容纳亲水材料的腔体设置在气道的周围，并通过通孔使得气道内腔与腔体内部相连通，使得气道内的水汽以及分泌物和细菌等杂质充分被亲水材料吸收。The cavity for accommodating the hydrophilic material is arranged around the airway, and the airway lumen communicates with the inside of the cavity through the through hole, so that the water vapor, secretions, bacteria and other impurities in the airway are fully absorbed by the hydrophilic material.

优选的情况下，内胆为圆柱体，气道位于圆柱体的中心，气道的周围为若干个小腔体比如2、3、4、5或6个等，小腔体的前端为开口端，后端为封闭端，亲水材料可以从小腔体的前端插入，小腔体的内侧腔壁开设有通向气道内腔的若干个小通孔，用于吸收气道内呼出气体中的水汽，分泌物、细菌等含有水分的杂质，小腔体的外侧腔壁的中间段即为所述开口，用于亲水材料和透湿膜的连通，透湿膜固定在内胆的骨架结构上以实现透湿膜密封包覆内胆。Preferably, the liner is a cylinder, the airway is located in the center of the cylinder, and there are several small cavities such as 2, 3, 4, 5 or 6 around the airway, and the front end of the small cavity is an open end , the rear end is a closed end, hydrophilic material can be inserted into the front end of the small cavity, and the inner cavity wall of the small cavity is provided with several small through holes leading to the inner cavity of the airway for absorbing the water vapor in the exhaled gas in the airway, For impurities containing moisture such as secretions and bacteria, the middle section of the outer cavity wall of the small cavity is the opening, which is used for the communication between the hydrophilic material and the moisture-permeable membrane. The moisture-permeable membrane is fixed on the skeleton structure of the inner tank to A moisture-permeable film is used to seal and cover the liner.

优选地，气道的横截面面积小于小腔体的横截面面积，使得水分过滤器内有足够的空间容纳相对多的亲水材料；同时使得本装置的死腔小，几乎不会影响呼出气体样本的实时检测曲线。Preferably, the cross-sectional area of the airway is smaller than the cross-sectional area of the small cavity, so that there is enough space in the moisture filter to accommodate a relatively large amount of hydrophilic materials; at the same time, the dead space of the device is small, which will hardly affect the exhaled gas The real-time detection curve of the sample.

其中，气道的前端面位于内胆前端面的后侧，即向后端缩进一段距离，其目的在于，即使有水汽或含水杂质从气道的前端流出，缩进的这段空间也可使水汽和含水杂质被位于前端的亲水材料（由于亲水材料的前端面位于小腔体的前端面上，因此，与缩进空间对应的小腔体内为亲水材料的前端）吸收并在亲水材料中扩散储存，使过滤膜保持干燥状态。Wherein, the front end of the airway is located behind the front end of the liner, that is, it is indented for a certain distance to the rear end. Water vapor and water-containing impurities are absorbed by the hydrophilic material at the front end (since the front end of the hydrophilic material is located at the front end of the small cavity, the small cavity corresponding to the indentation space is the front end of the hydrophilic material) Diffusion storage in hydrophilic materials keeps the filter membrane dry.

其中，过滤膜与底板的后表面之间设置有弹性垫圈，以提高气密性。Wherein, an elastic gasket is arranged between the filter membrane and the rear surface of the bottom plate to improve air tightness.

优选地，外套上开设有透气结构，比如删孔，亲水材料中的水汽和杂质中的水分会透过透湿膜和透气结构慢慢地挥发到大气中。Preferably, the coat is provided with a breathable structure, such as opening holes, and the moisture in the hydrophilic material and the moisture in the impurities will slowly evaporate into the atmosphere through the moisture-permeable film and the breathable structure.

附图说明Description of drawings

图1本发明水汽过滤器的一种实施例的结构示意图。Fig. 1 is a schematic structural view of an embodiment of the water vapor filter of the present invention.

图中各标号示例如下：Examples of labels in the figure are as follows:

1-内胆，2-气道，2-1-气道出气口，3-小腔体，4-鲁尔接头，5-透湿膜，6-亲水材料，7-过滤膜，8-弹性垫圈，9-骨架结构，9-1-前端骨架，9-2-纵骨架，9-3-后端骨架，9-4-短圆柱体，10-凸块，11-外套，12-底板，13-出气管，14-栅孔，15-小开口。1-inner tank, 2-airway, 2-1-airway outlet, 3-small cavity, 4-Luer connector, 5-moisture-permeable membrane, 6-hydrophilic material, 7-filter membrane, 8- Elastic washer, 9-frame structure, 9-1-front frame, 9-2-longitudinal frame, 9-3-rear frame, 9-4-short cylinder, 10-bump, 11-coat, 12-bottom plate , 13-outlet pipe, 14-grid hole, 15-small opening.

具体实施方式Detailed ways

为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

图1为本发明水汽过滤器的一种实施例的结构示意图。该水汽过滤器包括有内胆1和外套11，内胆1和外套11之间固定有过滤膜7，且内胆1的形状和大小与外套11的形状和大小相适配（本实施例中内胆为圆柱体，外套的内腔为圆柱体，但内胆和外套并不局限于圆柱体形状，还可以是棱柱形等，只要两者能够相互匹配即可）；水汽过滤器还包括有连接结构，通过固定内胆1和外套11的相对位置进而固定过滤膜7的位置使得过滤膜7将内胆1的前端面与外套11的底板的后表面隔离、只容许干燥气体由过滤膜7通过。具体地，内胆1为圆柱体形状，沿圆柱体的纵向（轴向）在圆柱体的中心处开设有气道2，气道2包括位于内胆前端的出气口2-1和位于内胆后端的进气口，内胆后端的进气口连接有鲁尔接头4，通常为鲁尔母接头，便于水汽过滤器与采样管连接（当然，根据实际需要，气道的进气口还可以与其它连接机构相连）。内胆1在气道2的周围开设有用于容纳亲水材料6的4个小腔体3，小腔体3的前端为开口端，小腔体3的后端为封闭端，每个小腔体3的内侧腔壁上均开设有若干个通向气道2内腔的小通孔，小腔体3的外侧腔壁的中段为开口，本实施例中的亲水材料6为4根吸水棉芯，分别从小腔体3的前端开口端插入小腔体3内，并且吸水棉芯通过小腔体3的开口可将吸水棉芯内的水分向外挥发，以延长水汽过滤器的使用寿命。由于小腔体3的外侧腔壁为开口，形成了内胆1的外侧壁的开放结构和骨架结构，开放结构即为开口形成的凹陷，或者两个开口相连通形成的凹陷，其中的骨架结构即为开口后剩余的结构，包括位于内胆1前端的沿内胆外侧壁周向的前端骨架9-1，位于内胆后端的沿内胆外侧壁周向的后端骨架9-3，和位于内胆中段的沿内胆纵向的纵骨架9-2。透湿膜5通过固定在骨架结构9上进而密封包覆内胆1，这里的固定优选是黏结固定，以保证从鲁尔接头4、气道2的进气口进入的气体不会从内胆1的外侧泄露。Fig. 1 is a structural schematic diagram of an embodiment of the water vapor filter of the present invention. The water vapor filter includes aninner bag 1 and anovercoat 11, afilter membrane 7 is fixed between theinner bag 1 and theovercoat 11, and the shape and size of theinner bag 1 are adapted to the shape and size of the overcoat 11 (in this embodiment The inner tank is a cylinder, and the inner cavity of the jacket is a cylinder, but the inner tank and the jacket are not limited to the shape of a cylinder, and can also be prismatic, etc., as long as the two can match each other); the water vapor filter also includes The connection structure fixes the position of thefilter membrane 7 by fixing the relative position of theinner tank 1 and theouter cover 11 so that thefilter membrane 7 isolates the front end of theinner tank 1 from the rear surface of the bottom plate of theouter cover 11, allowing only dry gas to pass through thefilter membrane 7 pass. Specifically, theliner 1 is in the shape of a cylinder, and anairway 2 is opened at the center of the cylinder along the longitudinal direction (axial direction) of the cylinder. Theairway 2 includes an air outlet 2-1 at the front end of the liner and a The air inlet at the rear end, the air inlet at the rear end of the liner is connected with aLuer connector 4, usually a Luer female connector, which is convenient for the connection between the water vapor filter and the sampling tube (of course, according to actual needs, the air inlet of the airway can also be connected to other connecting mechanisms). Theliner 1 is provided with 4small cavities 3 for accommodatinghydrophilic materials 6 around theairway 2. The front end of thesmall cavity 3 is an open end, and the rear end of thesmall cavity 3 is a closed end. Each small cavity The inner cavity wall of thebody 3 is provided with several small through holes leading to the inner cavity of theairway 2, the middle section of the outer cavity wall of thesmall cavity body 3 is an opening, and thehydrophilic material 6 in this embodiment is 4 water-absorbing The cotton cores are respectively inserted into thesmall cavity 3 at the front opening end of thesmall cavity 3, and the water-absorbing cotton core can volatilize the moisture in the water-absorbing cotton core through the opening of thesmall cavity 3, so as to prolong the service life of the water vapor filter . Since the outer cavity wall of thesmall cavity 3 is an opening, the open structure and the skeleton structure of the outer wall of theliner 1 are formed, and the open structure is the depression formed by the opening, or the depression formed by two openings being connected, and the skeleton structure therein That is, the remaining structure after the opening, including the front end frame 9-1 located at the front end of theliner 1 along the circumference of the outer wall of the liner, the rear end frame 9-3 located at the rear end of the liner along the circumference of the outer wall of the liner, and A longitudinal frame 9-2 along the longitudinal direction of the inner container located in the middle section of the inner container. The moisture-permeable membrane 5 is fixed on theskeleton structure 9 to seal and coat theinner container 1. The fixing here is preferably bonded and fixed to ensure that the gas entering from theLuer connector 4 and the air inlet of theairway 2 will not flow out of the inner container. 1 leaks outside.

其中，本实施例中的连接结构包括从内胆后侧延伸出的一段短圆柱体9-4（与内胆为一整体结构），短圆柱体9-4的半径大于所述后端骨架9-3的半径并相对于后端骨架9-3形成一周向的凸台阶结构，凸台阶结构上设置有凸块10，相应地，连接结构还包括在外套11的相应位置上设置的小开口15，所述内胆1插入所述外套11后，所述凸块10卡入所述小开口15以固定内胆1和外套11的相对位置。连接结构中的短圆柱体9-4与后端骨架9-3形成的周向的凸台阶，还起到定位和密封的作用，透湿膜5在包覆骨架结构时，其后端卡在凸台阶结构的前端面上，即起到定位透湿膜5的作用；另外周向凸台阶结构的前端面对透湿膜5与后端骨架9-3之间的缝隙起到了进一步密封的作用，气体不能从透湿膜5与后端骨架9-3之间的缝隙泄露。当然，还可以选择其它的卡扣结构作为连接结构，或选择其它类型的连接结构。Wherein, the connection structure in this embodiment includes a section of short cylinder 9-4 extending from the rear side of the inner tank (integrated with the inner tank), and the radius of the short cylinder 9-4 is larger than that of therear end skeleton 9 The radius of -3 forms a circumferential convex step structure relative to the rear end frame 9-3, and the convex step structure is provided with abump 10. Correspondingly, the connecting structure also includes asmall opening 15 provided at a corresponding position of theouter casing 11 After theliner 1 is inserted into theouter case 11 , theprotrusion 10 snaps into thesmall opening 15 to fix the relative positions of theinner liner 1 and theouter case 11 . The circumferential convex step formed by the short cylinder 9-4 and the rear-end skeleton 9-3 in the connection structure also plays the role of positioning and sealing. When the moisture-permeable membrane 5 wraps the skeleton structure, its rear end is stuck on the The front end surface of the convex step structure plays the role of positioning the moisture-permeable membrane 5; in addition, the front-end surface of the circumferential convex step structure plays a role of further sealing the gap between the moisture-permeable membrane 5 and the rear end frame 9-3 , the gas cannot leak from the gap between the moisture-permeable membrane 5 and the rear frame 9-3. Of course, other buckle structures can also be selected as the connection structure, or other types of connection structures can be selected.

优选地，所述短圆柱体9-4的半径与所述后端骨架9-3的半径的差值等于包覆在所述骨架结构9上的透湿膜5的厚度。使得包覆有透湿膜5的骨架结构与短圆柱体9-4的半径相等，当内胆1插入外套11后，骨架结构上的透湿膜5可以与外套内腔壁紧密接触，通过外套内腔壁的按压，进一步保证了透湿膜5对内胆1的密封性。Preferably, the difference between the radius of the short cylinder 9 - 4 and the radius of the rear frame 9 - 3 is equal to the thickness of the moisture-permeable membrane 5 covering theframe structure 9 . Make the skeleton structure coated with the moisture-permeable membrane 5 equal to the radius of the short cylinder 9-4, when theliner 1 is inserted into thejacket 11, the moisture-permeable membrane 5 on the skeleton structure can be in close contact with the inner cavity wall of the jacket, and pass through the jacket The pressing of the wall of the inner cavity further ensures the tightness of the moisture-permeable membrane 5 to theinner container 1 .

优选地，亲水材料6的前端面位于小腔体3的前端面上，气道2的气道出气口2-1处的腔壁要向内胆1后端缩进，在没有腔壁的阻挡的情况下，若在气道出气口2-1处存在有水汽或含水杂质，气道出气口2-1处的水汽和含水杂质更容易与亲水材料6相接触，并进入到亲水材料6内进而在亲水材料6内扩散储存，进一步防止水分堵塞过滤膜7，并有效地保证了过滤膜7的干燥。Preferably, the front end surface of thehydrophilic material 6 is located on the front end surface of thesmall cavity 3, and the cavity wall at the airway outlet 2-1 of theairway 2 is retracted toward the rear end of theinner bag 1, and there is no cavity wall In the case of blocking, if there is water vapor or water-containing impurities at the airway outlet 2-1, the water vapor and water-containing impurities at the airway outlet 2-1 are more likely to contact thehydrophilic material 6 and enter thehydrophilic material 6. Thematerial 6 is further diffused and stored in thehydrophilic material 6, further preventing moisture from clogging thefilter membrane 7, and effectively ensuring the drying of thefilter membrane 7.

外套11的内腔为圆柱体，外套11的前端为带有出气孔的密封固定的底板12，外套11的后端为开放端，内胆1通过外套11的后端插入外套11内，通过连接结构固定内胆1和外套11的相对位置，并通过内胆1的前端面和底板12的后表面挤压过滤膜7，使过滤膜7固定在内胆的前端面与底板的后表面之间，将过滤膜前后的空间隔离，仅有干燥的气体才能通过。外套11的对应于内胆1中段的位置上开设有透气结构，比如栅孔14，使得透湿膜5、过滤膜7围城的进气腔内的水汽和杂质中的水分可以通过亲水材料6、小腔体3的开口、透湿膜5、栅孔14挥发到大气中，这样过滤器就可以长时间反复使用，不会因为水分的存在而堵塞过滤膜7。The inner cavity of theovercoat 11 is a cylinder, the front end of theovercoat 11 is a sealed andfixed base plate 12 with an air outlet, the rear end of theovercoat 11 is an open end, and theliner 1 is inserted into theovercoat 11 through the rear end of theovercoat 11. The structure fixes the relative position of theinner tank 1 and theouter cover 11, and squeezes thefilter membrane 7 through the front surface of theinner tank 1 and the rear surface of thebottom plate 12, so that thefilter membrane 7 is fixed between the front surface of the inner tank and the rear surface of the bottom plate , to isolate the space before and after the filter membrane, and only dry gas can pass through. The position corresponding to the middle section of theliner 1 of thejacket 11 is provided with a breathable structure, such as agrid hole 14, so that the water vapor and the moisture in the impurity in the air intake chamber surrounded by the moisture-permeable membrane 5 and thefilter membrane 7 can pass through thehydrophilic material 6 , the opening of thesmall cavity 3, the moisture-permeable membrane 5, and thegrid hole 14 are volatilized into the atmosphere, so that the filter can be used repeatedly for a long time without blocking thefilter membrane 7 due to the presence of moisture.

优选地，过滤膜7和底板12的后表面之间设置有弹性垫圈，以提高过滤膜7与外套的底板12之间，过滤膜7与内胆的前端面之间的气密性。Preferably, an elastic gasket is arranged between thefilter membrane 7 and the rear surface of thebottom plate 12 to improve the airtightness between thefilter membrane 7 and thebottom plate 12 of the outer casing, and between thefilter membrane 7 and the front end of the inner container.

使用时，鲁尔接头4与采样管相连，呼出的气体样本从鲁尔接头4进入气道的进气口，并从气道的进气口朝气道的出气口2-1移动，在气体移动的过程中，气体含有的水汽以及含水杂质通过气道内腔与小腔体3之间的小通孔被亲水材料6吸收，若还有部分水汽或杂质中的水分剩余，在气道2前端的缩进空间被亲水材料6的前端吸入，仅有干燥的气体才从过滤膜7穿过并从底板的出气孔和出气管13排出并进而进入气体分析仪。可见，本发明的水汽过滤器结构简单、价格低廉、安装使用方便，可有效除去呼出气体中的水汽和含水杂质，以延长气体分析仪的使用寿命；同时气体通道为直线型的，结构中几乎没有死角，气体死腔小，几乎不会影响气体样本的实时测量曲线，而且不需要大量采样。When in use, theLuer connector 4 is connected to the sampling tube, and the exhaled gas sample enters the inlet port of the airway from theLuer connector 4, and moves from the inlet port of the airway toward the outlet port 2-1 of the airway. During the process, the water vapor and water-containing impurities contained in the gas are absorbed by thehydrophilic material 6 through the small through hole between the inner cavity of the airway and thesmall cavity 3. The indentation space is sucked by the front end of thehydrophilic material 6, and only the dry gas passes through thefilter membrane 7 and is discharged from the air outlet hole and theair outlet pipe 13 of the bottom plate and then enters the gas analyzer. It can be seen that the water vapor filter of the present invention is simple in structure, low in price, easy to install and use, and can effectively remove water vapor and water-containing impurities in the exhaled gas to prolong the service life of the gas analyzer; at the same time, the gas channel is linear, and the structure is almost There is no dead angle, and the gas dead space is small, which will hardly affect the real-time measurement curve of the gas sample, and does not require a large number of samples.

其中，水汽过滤器中的小腔体3并不局限于上述的结构，还可以是围绕气道2开设的其它数量的小腔体，还可以是绕气道2的横截面为环形的腔体等，腔体内用于容纳亲水材料6以暂时储存呼出气体中的水汽和含水杂质。优选地，腔体的前端面为开口端用于插入亲水材料，腔体的后端面为封闭端，腔体的内侧腔壁与气道内腔通过小通孔相连通，使得呼出气体中的水分通过小通孔被亲水材料所吸收，腔体的外侧腔壁为开口，使得亲水材料内的水分通过透湿膜5挥发出去。当亲水材料中的水汽过多或杂质过多时，可以通过更换亲水材料6来达到反复使用的目的。Wherein, thesmall cavity 3 in the water vapor filter is not limited to the above-mentioned structure, it can also be other numbers of small cavities opened around theair channel 2, and it can also be a cavity with a circular cross section around theair channel 2 etc., the cavity is used to accommodate thehydrophilic material 6 to temporarily store the water vapor and water-containing impurities in the exhaled gas. Preferably, the front end of the cavity is an open end for inserting a hydrophilic material, the rear end of the cavity is a closed end, and the inner cavity wall of the cavity communicates with the inner cavity of the airway through a small through hole, so that the moisture in the exhaled gas It is absorbed by the hydrophilic material through the small through holes, and the outer cavity wall of the cavity is an opening, so that the moisture in the hydrophilic material evaporates through the moisture-permeable membrane 5 . When there is too much moisture or impurities in the hydrophilic material, the purpose of repeated use can be achieved by replacing thehydrophilic material 6 .

其中的亲水材料6可以为具有亲水性的吸水棉芯，还可以为其它的具有亲水性的材料，只要能够具备储存水汽和杂质中的水分即可。Thehydrophilic material 6 can be a hydrophilic absorbent cotton core, or other hydrophilic materials, as long as it can store moisture in water vapor and impurities.

其中的透湿膜5是指能透水但不透气的膜，比如：以聚氨基甲酸酯（TPU）为主要材料，导入亲水基的透湿膜，其薄膜表面无微孔，故不透气；但薄膜有亲水基，通过吸湿传导，从而具有透湿的功能。而其中的过滤膜7是指能透气但不透水的膜，比如：聚四氟乙烯PTFE或聚对苯二甲酸乙二酯PET过滤膜，用以滤除呼出气体样本中的水和其他污染物。The moisture-permeable membrane 5 refers to a membrane that is water-permeable but air-tight. For example, a moisture-permeable membrane that uses polyurethane (TPU) as the main material and introduces a hydrophilic group has no micropores on the surface of the membrane, so it is airtight. ; But the film has a hydrophilic group, which conducts through moisture absorption, so it has the function of moisture permeability. Wherein thefilter membrane 7 refers to a membrane that is breathable but impervious to water, such as: polytetrafluoroethylene PTFE or polyethylene terephthalate PET filter membrane, used to filter out water and other pollutants in the exhaled gas sample .

其中的外套11的栅孔14可以用其他的透气结构来代替，比如：若干透气孔。The grid holes 14 of thejacket 11 can be replaced by other air-permeable structures, such as several air-ventilating holes.

另外，本发明提供的水汽过滤器可以通过连接器与气体分析仪相连，为了配合连接器，外套11的前部分的结构被设计成：底板12向外套11的后端缩进，外套11的出气孔的前侧固定连接有一出气管13，出气管13的轴向平行于外套的轴向。In addition, the water vapor filter provided by the present invention can be connected with the gas analyzer through a connector. In order to cooperate with the connector, the structure of the front part of theovercoat 11 is designed as follows: thebottom plate 12 retracts to the rear end of theovercoat 11, and the outset of theovercoat 11 Anair outlet pipe 13 is fixedly connected to the front side of the air hole, and the axial direction of theair outlet pipe 13 is parallel to the axial direction of the overcoat.